Boom Wear Pad Maintenance - JLG sky trak mmv Service Manual

General Information, Specifications and Maintenance
2.13.19

Boom Wear Pad Maintenance

10
MS21402
a. Boom Wear Pad Check
Every 10 hours of engine operation, visually inspect the
boom wear pads (1), between the boom sections at the
rear and front of the boom for excessive wear.
The average expected service life of boom wear pads
varies depending on the particular location of each wear
pad within the boom, vehicle use, operating conditions,
and the load weight.
If load weights are at, or near, maximum capacity, or if the
vehicle is operating in very dirty or dusty conditions, the
boom wear pads will wear at a much faster rate.
2
7
4
3
1. Wear pad
2. Angle-cut wear
pad indicator
3. 0.625" (15,9 mm)
2.60
MT2290
1
5
6
OS12302
4. 0.375" (9,5 mm)
5. Metal insert
6. Boom plate
7. Wear pad spacer
The boom wear pads that are under the most stress from
weight of the load will also wear faster than other pads.
For example, the lower pads at the front of the boom are
under much more stress than the pads attached at the top
front or sides of the boom. Consequently, the lower pads
will require service more often.
b. Boom Wear Pad Replacement
Each boom wear pad (1), is manufactured with a conve-
nient wear pad indicator (2). This is the angled cut at each
end of all boom wear pads. The total thickness of a new
boom wear pad is 0.625" (15,9 mm) (3). The angled cut will
provide a total wear thickness of 0.25" (6,4 mm) (4). This
will leave approximately 0.375" (9,5 mm) of total unused
base material.
The pads must NEVER be worn past the angled cut indi-
cator, or the metal pad insert (5) that holds the pads in
place will begin to wear into the boom pad sliding surfac-
es. Pads worn past this point will gouge the boom surfac-
es. This will result in premature wear of any new boom
wear pads installed, eventually requiring, expensive re-
placement of the boom. Replacement of boom wear pads
must be performed when the boom wear pads
indicate.
c. Boom Wear Pad Lubrication
IMPORTANT: The boom has been factory lubricated for
proper wear pad break-in and will normally not require
further lubrication. However, after replacing any wear
pad(s), or after prolonged periods of inoperation, light
lubrication of the boom wear surfaces with a rust inhibi-
tor/lubricant is recommended to keep the boom wear
surfaces lubricated properly. Light lubrication of the boom
wear surfaces is also recommended in salt air climates,
and when the vehicle is stored, to help prevent rusting.
One such rust inhibitor that is specifically formulated for
this purpose is LPS 3. It is marketed by:
LPS Laboratories, Inc.
4647 Hugh Howell Rd.
Tucker GA 30085-5052 USA
Phone: 1-800-241-8334
Fax: (770) 493-9206
Model MMV Rev. 12/04